Important 10th class Chemistry MCQ questions for Board Exam







Chemical Reactions & Chemical Equations

 1.In the balanced equation – aFe2 O3 + bH2 → cFe + dH2 O The value of a,b,c,d are       respectively –
 (A) 1,1,2,3

(B) 1,1,1,1

(C) 1,3,2,3

(D) 1,2,2,3


   2.Which of the following reactions is not balanced 

(A) 2NaHCO3 → Na2 CO3, + H2 O + CO2

(B) 2C4 H10 + 1202 → 8CO2 + 10H2 O

(C) 2AI + 6H2O → 2AI (OH)3 + 3H2

(D) 4NH3 + 5O2 → 4NO + 6H2O


 3.The equation – Cu + xHNO3 → Cu(NO3 ) 2 + yNO2 + 2H2O The values of x and y are

(A) 3 and 5

(B) 8 and 6

(C) 4 and 2

(D) 7 and 1


4.Neutralization reaction is an example of –

(A) exothermic reaction

(B) endothermic reaction

(C) oxidation

(D) none of these


5.Which of the following statements is/are true :

(A) The total mass of the substance remains same in a chemical change.

(B) A chemical change is permanent and irreversible.

(C) A physical change is temporary and reversible.

(D) All the these.


6.Which of the following statements is correct

(A) A chemical equation tells us about the substances involved in a reaction.

(B) A chemical equation informs us about the symbols and formula of the substances involved in a reaction.

(C) A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.

(D) All are correct.


7. Zn(s) + H2 SO4 (aq) → ZnSO4 (aq) + H2 (g) is an example of

(A) precipitation reaction

(B) endothermic reaction

(C) evolution of gas

(D) change in color


8.When dilute hydrochloric acid is added to iron fillings –

(A) hydrogen gas and ferric chloride are produced.

(B) chlorine gas and ferric hydroxide are produced.

(C) no reaction takes place.

(D) iron salt and water are produced.


9.In the reaction xPb (NO3 )32  → Heat    yPbo + zNO2 + O2 x,y and z are –

(a) 1,1,2

(B) 2,2,4

(C) 1,2,4

(D) 4,2,2


10.In the reaction FeSo4 + x → Na2 SO4 + Fe(OH)2 , x is –

(A) Na2 SO4

(B) H2 SO4

(C) NaOH

(D) None of these



  •          QUESTION :   1      2      3     4      5      6      7       8       9       10
  •          ANSWER :        C     B      C     A     D     D      C       A     B       C




1.Chemical reaction 2Na + CI2 → 2 NaCI is an example of –

(A) Combination reaction

(B) decomposition reaction

(C) displacement reaction

(D) double displacement reaction


2.Which of the following equations is representing combination of two elements?

(A) CaO + CO2 → CaCO3

(B) 4 Na + O2 → 2Na2 O

(C) SO2 + 1/2 O2 → SO3

(D) 2Na + 2H2 O → 2NaOH + H2


3. Which of the following equations is not an example of single displacement reaction?

(A) 2AI + Fe2 O3 → AI2 O3 +   23Fe

(B) Ca + CO2 → CaCI2

(C) 2KI + CI2 → 2KCI + I2

(D) 2Na + 2H2 O → 2NaOH + H2


4.Which of the following is/are a decomposition reaction(s)?

(A) 2HgO  → Heat   2Hg + O2

(B) CaCO3  → Heat   CaO + CO2

(C) 2H2 O  →  Electrolys is H2 + O2

(D) All of these


5.Match the following –

Column A                                                                                                    Column B

Types of chemical reaction                                                        Chemical equation

(a) Combination reaction                                           (i) CaCO3 →∆ CaO + CO2

(b) Decomposition reaction                                      (ii) 2H2 O  → Electricity 2H2 + O2

(c) Displacement reaction                                         (iii) CaO + CO2 → CaCO3

(d) Analysis reaction                                                     (iv) Fe + CuSO4 (aq.) → FeSo4 (aq) + Cu

(A) a(ii), B(i), C(iv), d(iii)

(B) a(i), b(ii), c(iii), d(iv)

(C) a(iii), b(i), c(iv), d(ii)

(D) a(iii), b(i), c(iii), d(iv)

6.Which of the following reactions is/are a double displacement reactions (s) ?

(i) AgNO3 + NaBr → NaNO3 + AgBr

(ii) BaCI2 + H2 SO4 → BaSO4 + 2HCI

(iii) As4 O4 + 3H2 S → As2 S 3 + 3H 2 O

(iv) NaOH + HCI → NaCI + H2 O

 (A) (i) & (ii)

(B) only (iii)

(C) only (iv)

(D) (i) to (iv) all


7.AgNo3 (a) + NACI (Aq) → AgCI (s) + NaNO3 (Aq) Above reaction is a –

(A) precipitation reaction

(B) double displacement reaction

(C) combination reaction

( D) (A) and (B) both


8.H2 SO4 + 2NaOH → Na2 SO4 + 2H2 O

Above equation is a:-

i) neutralization reaction                                                (ii) double displacement reaction

(iii) decomposition reaction                                           (iv) addition reaction


(A) (i) to (iv) all

(B) (i) and (ii)

(C) (i) and (iii)

(D) (ii) and (iv)


9.Zn + H2 SO4 (dil) → ZnSO4 + H2

Above equation is a=

(A) Decomposition

(B) Single displacement reaction

(C) Combination reaction

(D) Synthesis reaction


10.The reaction in which two compounds exchange their ions to form two new compounds is

(A) a displacement reaction

(B) a decomposition reaction

(C) an addition reaction

(D) a double displacement reaction


  •          QUESTION    1     2     3    4     5     6     7     8     9    10
  •          ANSWER         A     B     B    D    C    D    D    B     B    D




1.In the reaction Mg + CI2 → MgCI2 Chlorine may be regarded as –

(A) an oxidizing agent

(B) a reducing agent

(C) a catalyst

(D) providing an inert medium

 2.When the gases sulfur dioxide and hydrogen sulfide react, the reaction is SO2 + 2H2 S → 2H2 O + 3S Here hydrogen      sulfide is acting as –

(A) an oxidizing agent

(B) a reducing agent

(C) a dehydrating agent

(D) a catalyst


3.Which of the following statements is/are false for oxidation reaction?

(A) Gain or addition of electro negative radical

(B) Removal of hydrogen atom.

(C) Removal or loss of electro positive radical or element

(D) None of these .


4. CiO + H2 → H2 O + Cu, reaction is an example of –

(A) redox reaction

(B) synthesis reaction

(C) neutralization

(D) analysis reaction


5.Which of the following is an example of oxidation reaction ?

(A) Sn+2 – 2e → Sn+4

(B) Fe+3 + e → Fe+2

(C) CI2 + 2e → 2CI

(D) None of these


6.In the process of burning of magnesium in air, magnesium undergoes –

(A) reduction

(B) sublimation

(C) oxidation

(D) all of these


7.A substance which oxidizes itself and reduces other is known as

(A) an oxidizing agent

(B) a reducing agent

(C) Both of these

(D) None of these.


8.Oxidation is a process which involves –

(A) addition of oxygen

(B) removal of hydrogen

(C) loss of electrons

(D) All are correct


9.In the reaction PbO + C → Pb + CO.

(A) PbO is oxidized

(B) C acts as oxidizing agent.

(C) C acts as a reducing agent.

(D) This reaction does not represent a redox reaction.


10.A redox reaction is one in which –

(A) both the substances are reduced.

(B) both the substances are oxidized.

(C) and acid is neutralized by the base.

(D) one substance is oxidized, which the other is reduced.



  •          QUESTION :   1     2     3     4      5      6      7       8       9       10
  •          ANSWER :        A     B     D     A     A     C      B       D     C       D





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